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3. Instruction Set
3-95
API Mnemonic Operands Function
34
SFTR P
Bit Shift Right
Controllers
ES2/EX2 SS2
SA2
SE
SX2
Bit Devices Word devices Program Steps Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S
* * * *
D
* * *
n
1
* *
n
2
* *
SFTR, SFTRP: 9 steps
PULSE 16-bit 32-bit
ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2 ES2/EX2 SS2
SA2
SE
SX2
Operands:
S: Start No. of source device D: Start No. of destination device n
1
: Length of data to be
shifted n
2
: Number of bits to be shifted as a group
Explanation:
1. This instruction performs a right shift from source device of n
2
bits starting from S to
destination device of n
1
bits starting from D.
2. This instruction is generally used in pulse execution mode (SFTRP).
3. Valid range of operand n1, n2 : 1≤ n2 ≤ n1 ≤1024
Program Example:
1. When X0 is rising edge triggered, SFTR instruction shifts X0~X4 into 16 bit data M0~M15
and M0~M15 also shift to the right with a group of 4 bits.
2. The figure below illustrates the right shift of the bits in one scan.
n M3~M0 → Carry
o M7~M4 → M3~M0
p M11~M8 → M7~M4
q M15~M12 → M11~M8
r X3~X0 → M15~M12 completed
X0
SFTR X0 M0 K16 K4
X3 X2 X1 X0
M15 M14 M13 M12 M11 M10 M9 M8 M7 M6
M5
M4 M3 M2 M1 M0
1234
5
4 bits in a group shift to the right
Carry